Six themes for QG in 2015 (developments to watch for)

In summary, the six research topics that are mentioned in this summary are: algebraic geomatter, flux formulation LQG, LambdaCDM bounce, projective LQG, planck star, and starbounce.
  • #36
Maybe I erred in identifying these 6 themes as especially interesting to watch for developments in. I want to check the 6 I picked out earlier against the titles of the talks at Tux last week. The EFI workshop ended on 20 Feb. Let's see if I can copy the program's list of talks here so we can scan it and see what stands out. I've highlighted some of those that caught my attention. There are a lot of interesting themes here, including several that go beyond the 6 identified earlier. In the case of some talks, like the first one here on "quantum enumerative geometry" I simply could not guess what they might be about:
http://www.gravity.physik.fau.de/events/tux3/tux3.shtml

Piotr Sulkowski:
Chern-Simons theory and quantum enumerative geometry

Mehdi Assanioussi:
Construction of a hamiltonian operator in LQG

Beatriz Elizaga:
Effective homogeneous and isotropic scenarios emerging from states of the hybrid Gowdy model

Maciej Dunajski:
Non-relativistic twistor theory and Newton-Cartan geometry

Giuseppe Sellaroli:
Spinor operators in 3D Lorentzian gravity

Muxin Han:
Chern-Simons Theory, Flat Connections and 4d Quantum Geometry


Marcin Kisielowski:
First-order Dipole Cosmology

Guillermo Mena Marugan:
Mukhanov-Sasaki equations in Loop Quantum Cosmology


John Schliemann:
Coherent Quantum Dynamics: What Fluctuations Can Tell

Ilkka Mäkinen:
Coherent state operators in loop quantum gravity

Ivan Agullo:
Phenomenological consequences of LQC


Tomasz Pawlowski:
Interfacing loop quantum gravity with cosmology

Edward Wilson-Ewing:
A Lambda-CDM Bounce Scenario


Andrzej Dragan:
Ideal clocks - convenient fiction

Goffredo Chirco:
Statistical mechanics for general covariant systems


Martin Ammon:
Recent developments in AdS/CFT and higher spin gravity

Jorge Pullin:
Recent results in spherically symmetric LQG

Mercedes Martin-Benito:
More information about the early Universe than meets the eye

Carlo Rovelli:
Can we test quantum gravity with black hole explosions?


Benjamin Bahr:
Background-independent renormalization in Spin Foam models


Maite Dupuis:
Towards the Turaev-Viro amplitudes from a Hamiltonian constraint

Maximillian Hanusch:
Symmetry Actions and Invariance Conditions in LQG

Xiangdong Zhang:
Loop quantum cosmology in 2+1 dimensions

Simone Speziale:
First order gravity on the light front

Wolfgang Wieland:
New action for simplicial gravity: Curvature and relation to Regge calculus


Florian Girelli:
The Turaev-Viro amplitude from a Hamiltonian constraint, Part 2.

Jedrzej Swiezewski:
Radial gauge - reduced phase space of General Relativity

Lacina Kamil:
The problem of time in background independence

Andrea Dapor:
Rainbows from Quantum Gravity

Francesca Vidotto:
The compact phase space of Loop Quantum Gravity


Norbert Bodendorfer:
A quantum reduction to Bianchi I models in LQG

Marc Geiller:
Flux formulation of loop quantum gravity


Saeed Rastgoo:
Polymerization and saddle point approximation issues in dilatonic black hole

Thirty-three talks. I find that, scanning down to see which ones "rang a bell", for whatever reason, I highlighted ten of them.
 
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  • #37
The Tux conference in February was, I think, a good indicator of active lines of QG research being pursued, and the slides for each talk are now posted.
http://www.gravity.physik.fau.de/events/tux3/tux3.shtml
So let's check it out and get an overview. I've starred the talks that especially caught my attention and which in several cases have something to do with the themes I mentioned at the start of the thread. I'll take a closer look at those marked with an asterisk. If anyone else notices other talks of particular interest, please point them out. I'd appreciate others' perspectives on the topics covered in the conference:
  • Mehdi Assanioussi, http://www.gravity.physik.fau.de/events/tux3/assanioussi.pdf
  • Norbert Bodendorfer, http://www.gravity.physik.fau.de/events/tux3/bodendorfer.pdf
  • Goffredo Chirco, http://www.gravity.physik.fau.de/events/tux3/chirco.pdf *
  • Andrea Dapor, http://www.gravity.physik.fau.de/events/tux3/dapor.pdf
  • Beatriz Elizaga de Navascues, http://www.gravity.physik.fau.de/events/tux3/elizaga.pdf
  • Muxin Han, http://www.gravity.physik.fau.de/events/tux3/han.pdf *
  • Maximilian Hanusch, http://www.gravity.physik.fau.de/events/tux3/hanusch.pdf
  • Marcin Kisielowski, http://www.gravity.physik.fau.de/events/tux3/kisielowski.pdf
  • Ilkka Mäkinen, http://www.gravity.physik.fau.de/events/tux3/maekinen.pdf
  • Mercedes Martin-Benito, http://www.gravity.physik.fau.de/events/tux3/martin.pdf
  • Guillermo Mena Marugan, http://www.gravity.physik.fau.de/events/tux3/mena.pdf
  • Tomasz Pawlowski, http://www.gravity.physik.fau.de/events/tux3/pawlowski.pdf
  • Jorge Pullin, http://www.gravity.physik.fau.de/events/tux3/pullin.pdf
  • Saeed Rastgoo, http://www.gravity.physik.fau.de/events/tux3/rastgoo.pdf
  • Carlo Rovelli, http://www.gravity.physik.fau.de/events/tux3/rovelli.pdf *
  • Giuseppe Sellaroli, http://www.gravity.physik.fau.de/events/tux3/sellaroli.pdf
  • Jedrzej Swiezewski, http://www.gravity.physik.fau.de/events/tux3/swiezewski.pdf
  • Francesca Vidotto, http://www.gravity.physik.fau.de/events/tux3/vidotto.pdf *
  • Wolfgang Wieland, http://www.gravity.physik.fau.de/events/tux3/wieland.pdf *
  • Edward Wilson-Ewing, http://www.gravity.physik.fau.de/events/tux3/wilson.pdf *
  • Xiangdong Zhang, http://www.gravity.physik.fau.de/events/tux3/zhang.pdf
For convenience here's the list of 6 starred ones:
Goffredo Chirco, http://www.gravity.physik.fau.de/events/tux3/chirco.pdf *
Muxin Han, http://www.gravity.physik.fau.de/events/tux3/han.pdf *
Carlo Rovelli, http://www.gravity.physik.fau.de/events/tux3/rovelli.pdf *
Francesca Vidotto, http://www.gravity.physik.fau.de/events/tux3/vidotto.pdf *
Wolfgang Wieland, http://www.gravity.physik.fau.de/events/tux3/wieland.pdf *
Edward Wilson-Ewing, http://www.gravity.physik.fau.de/events/tux3/wilson.pdf *
 
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  • #38
From the looks of things, I'm not doing all that well. Of the 6 themes I started with only 3 (the even numbered ones it turns out) were represented at the conference:
2. refers to December 2014 paper by Haggard Han Kaminsky Riello (google "4D loop quantum gravity with a cosmological constant", part of the title of their paper) and February 2015 paper by Rovelli Vidotto ("compact phase space, cosmological constant, discrete time")
4. google "LambdaCDM bounce" for standard cosmology combined with matter bounce/Loop bounce.
6. google "planck star" for work by Barrau, Rovelli, Vidotto on prospects of seeing collapse rebound explosions

For example:
Goffredo Chirco, http://www.gravity.physik.fau.de/events/tux3/chirco.pdf *
Muxin Han, http://www.gravity.physik.fau.de/events/tux3/han.pdf * (theme 2)
Carlo Rovelli, http://www.gravity.physik.fau.de/events/tux3/rovelli.pdf * (theme 6)
Francesca Vidotto, http://www.gravity.physik.fau.de/events/tux3/vidotto.pdf * (theme 2)
Wolfgang Wieland, http://www.gravity.physik.fau.de/events/tux3/wieland.pdf *
Edward Wilson-Ewing, http://www.gravity.physik.fau.de/events/tux3/wilson.pdf * (theme 4)

AFAICS none of the talks dealt with the other themes, the odd numbered ones:
1. refers to Sep and Dec 2014 papers by Chamseddine Connes Mukhanov where quanta of both GR geometry and StdMdl matter seem to grow from the same algebraic root
3. google "flux formulation LQG" for Dittrich&Geiller new formulation of LQG, likely opening to the GR limit.
5. google "projective LQG" for massive work by Lanery&Thiemann reformulating LQG.

BTW Muxin Han gave a similar talk (same slide set) just this past week (10 March) on ILQGS. And the audio is online! This is connected with the HHKR paper where they use constant curvature simplexes to implement the cosmological curvature constant Lambda. Listening to the audio while reviewing the slides could help understand the HHKR (Haggard Han Kaminsky Riello) paper
http://relativity.phys.lsu.edu/ilqgs/han031015.pdf
http://relativity.phys.lsu.edu/ilqgs/han031015.wav

Chirco's talk is part of an important research initiative, to attain a general covariant version of statistical mechanics and thermodynamics. I should have included it earlier and will discuss it.
In a general covariant context there is no preferred time, no absolute notion of energy, no Hamiltonian, so how to do stat mech and thermodynamics, which require these things? It seems that statistical physics has to be rebuilt from the ground up. Analogs of the basic thermo ideas have to be constructed in the general covariant context. I would like to understand Chirco's slides better, and wish there were audio available to go with them.
 
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